babeltrace2: upgrade 2.0.4 -> 2.0.5

babeltrace2: upgrade 2.0.4 -> 2.0.5

Changelog:
==========
 * bt2: honor build system compiler/linker preferences
 * Fix: clear_string_field(): set first character to 0
 * Fix: src.ctf.fs: Not resolving event common ctx
 * debug-info: fix -Wenum-int-mismatch problem in copy_field_class_content_internal
 * fix: pass exec-prefix to python bindings install
 * fix: document proper Bison version requirement
 * cli: use return value of g_string_free
 * babeltrace2-query(1): erroneous parameter used in example
 * Fix: tests: print real values in a fixed format
 * Fix: bt2: autodisc: remove thread error while inserting status in map
 * tests: src.ctf.fs: add test for metadata with invalid syntax
 * tests: shorten names of session-rotation trace
 * bt2: ignore -Wredundant-decls warning
 * ctf: fix -Wformat-overflow error in ctf-meta-resolve.cpp
 * ctf-writer: fix -Wformat-overflow errors in resolve.c
 * Fix: src.text.details: use write_uint_prop_value to handle unsigned values in write_int_range
 * Add `dev-requirements.txt` for pip
 * Fix: src.ctf.lttng-live: consider empty metadata packet as retry
 * Fix: ctf: wrongfully requiring CTF metadata signature for every section
 * Fix: src.ctf.lttng-live: session closed before any metadata is received
 * fix: obsolete warnings with autoconf >= 2.71
 * fix: explicitly disable '-Wsuggest-attribute=format'
 * fix: set stable branch in gitreview config
 * Fix: ctf-writer: list of reserved keywords
 * compiler warning cleanup: is_signed_type: compare -1 to 1
 * Update working version to Babeltrace 2.0.5

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>